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It only affects people who store their authors in LN, FN format or have other reasons for having a comma in the name like "Joe Bloggs, Jr". In earlier versions of calibre any commas would get converted to underscores when determining the author folder name on disk within the calibre library.
Kovid made a change a few months ago to now allow commas, which means if you subsequently added books for one of those existing authors you end up with two versions of the folder name internally in calibre's library - with "legacy" books in the folder with the underscore, and new books in the folder with the comma.
It does zero harm, there is no duplication, but for the OCD types you can get to a single version of the author name folder by either using the plugin I mentioned above or as Kovid says temporarily renaming the author in calibre and then reverting it back.
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